STUDY OF HUMPING TENDENCY AND AFFECTING FACTORS IN HIGH SPEED LASER WELDING OF STAINLESS STEEL SHEET
PEI Yinglei 1, SHAN Jiguo 1,2, REN Jialie 1
1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084
2. Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084
Cite this article:
PEI Yinglei SHAN Jiguo REN Jialie. STUDY OF HUMPING TENDENCY AND AFFECTING FACTORS IN HIGH SPEED LASER WELDING OF STAINLESS STEEL SHEET. Acta Metall Sin, 2012, 48(12): 1431-1436.
The fiber laser was used to weld austenitic stainless steel SUS304 sheet at the speed of 24 m/min. The effects of laser power, welding speed and shielding gas on humping tendency have been investigated. The melt flow in the molten pool under different welding parameters was studied by Ti tracer method and CCD visual detection system. The results show that the humping tendency is not sensitive to the laser power. The humping is formed when welding speed exceeds 18 m/min, and goes up with the increasing of welding speed. The humping tendency is completely different as changing the direction of shielding gas under constant welding speed and laser power, and it is reduced when the shielding gas direction follows the welding direction. It can be explained that, with the increasing of welding speed, the melt flow becomes fierce, and the humping tendency goes up. The weld shape turns to the "columnar weld", when the shielding gas direction against the welding direction; the weld shape turns to the "cup weld" when the shielding gas direction follows the welding direction. The "cup weld" expanded "U area" which gentles the melt flow and reduces humping tendency. Therefore, adjusting the shielding gas direction to expand the "U area" is an effective approach to reduce the humping tendency.
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